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Zane Joze March 29, 2001 08:52

best liquid-vapour modelling
 
hi everybody

just want to know some suggestions about two-phase modelling (liquid-vapour), what methods are the simpliest and very exact?

thanks for any help

zane

Bubba March 30, 2001 04:30

Re: best liquid-vapour modelling
 
Answer is problem dependent. State your problem and then one can answer...

Dia Zeidan March 30, 2001 11:03

Re: best liquid-vapour modelling
 
Hello,

I'm working with two-phase flow (liquid-vapour). could you please explain what do you mean by simplest and very exact.

regards

Dia

Zane Joze April 5, 2001 04:12

Re: best liquid-vapour modelling
 
Well the situation is like this. I believe all the comercial program and codes are limited to some general problems in CFD. In my case special time dependent boundary conditions are used. I am used to do all the code by myself, but to this time I simulated only one phase (liquid phase). I have sola-vof and nasa-3d source codes, but to set my boundary conditions into the codes and adjust the code is far two complicated. I rather discretised equations and programming all by myself. So is there any good books or papers where equations for liquid-vapour phase are described in discretised form (all terms included). I found Fletcher's CFD book for liquid phase very easy to read, where all terms are precisesly described. I wrote From that form it is not hard to write a program to solve equations. Any suggestions? Thanks. Zane

Dia Zeidan April 10, 2001 11:52

Re: best liquid-vapour modelling
 
Why don't you solve for single pressure model.

Bubba April 12, 2001 17:27

Re: best liquid-vapour modelling
 
For multiphase modelling you can go several ways depending on the degree of complexity you want.

ie.

1) homogeneous model 2) 6 equation model 3) 1 fluid model

Interface tracking models use a one fluid formulation. Looking at this the NS equations are the same as in a one fluid, except you will want surface tension and the second part of the viscous term. The method to solve this equation is typically done using a projection method however I am seeing more and more people using Simple schemes.

---------------------------------------------------- Good books...

1)Ferziger and Peric: (Computational Methods for Fluid Dynamics)

2)Patankar: Numerical Heat Transfer and Fluid Flow.

---------------------------------------------------- Did you want mass transfer in the model as well? This is the fun part :)


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